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Legba,
I was thinking you might check the cats. I have heard of instances where a plugged exhaust can cause the symptoms you describe. Bring the car up to operating temp gently, then hit both the front and the back of the cat with an infrared thermometer. Exit temp of the cat should be much hotter than the entrance. I would also give the cats a vey light blows with a mallet and listen for loose particulate.
Keep us posted!
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